September 29 2026
claims about what exists (or has existed/will exist) in the world:
“Democracy is a type of political regime.”
“Russia is a democracy.”
“58% of countries worldwide are democracies.”
“Countries in Western Europe are more democratic than those in Eastern Europe.”
“Countries around the world have become less democratic since 2016.”
“Countries experiencing higher inflation have had greater declines in democracy.”
Why do we care about using science to assess descriptive claims?
How can we decide which claim about “threat to democracy” is right?

“Countries around the world have become less democratic since 2016.”
What would you want to know before you could judge whether this claim was correct or incorrect?
“Countries around the world have become less democratic since 2016.”
We need a toolbox for scientific evidence:
You can use these tools when deciding whether to accept claims, or when making your own claims
When we evaluate evidence for descriptive claims, we want to think about severity
or conversely…
Claim: “House is not on fire” Evidence: smoke detector
| The House is SAFE (Claim is True) |
The House is ON FIRE (Claim is False / Error Exists) |
|
|---|---|---|
| ALARM says: “SAFE” (Claim passes test) |
True Safety • Correct result. |
False Pass (Type II Error) • The alarm stayed silent during a fire. • This is a blind test! |
| ALARM says: “FIRE!” (Claim fails test) |
False Alarm (Type I Error) • It went off because of burnt toast. |
Fire Detected (Recall/Sensitivity) • Correctly caught the danger. |
Concepts: define our terms in a way that is transparent and can be used systematically. If concepts are opaque or idiosyncratic \(\to\) STOP!
Variables: translate concepts into something that we can (in principle) observe. If variables do not correspond to the concept / correspond to other concepts \(\to\) STOP!
Measurement: devise transparent and systematic procedures with known uncertainty to observe those attributes of specific cases. If measurement procedure is opaque, likely to suffer from bias, or has high degree of uncertainty \(\to\) STOP!
A useful definition:
In social science we discuss “cases”, not in the legal sense, but in this sense:
a specific individual, organization, entity, event, or action, existing in a specific time and place.
We are often interested in identifying what general categories this specific case belongs to, what is its “type”. Or measuring attributes of that case. (How much of something it has, e.g.)
What cases are relevant to these claims?
“Democracy is a type of political regime.”
“Russia is a democracy.”
“58% of countries worldwide are democracies.”
“Countries in Western Europe are more democratic than those in Eastern Europe.”
“Countries around the world have become less democratic since 2016.”
“Countries experiencing higher inflation have had greater declines in democracy.”
At a general level:
concepts: abstract or general categories that we (humans) apply to particular cases/instances. They abstract away from the highly particular, complex, and often unique features of reality.
Our thought and our language is rooted in concepts!
How would you define what a “chair” is?
Ludwig Wittgenstein, Philosophical Investigations
Takeaway: definitions/concepts are…
“… In that Empire, the Art of Cartography attained such Perfection that the map of a single Province occupied the entirety of a City, and the map of the Empire, the entirety of a Province. In time, those Unconscionable Maps no longer satisfied, and the Cartographers Guilds struck a Map of the Empire whose size was that of the Empire, and which coincided point for point with it. The following Generations, who were not so fond of the Study of Cartography as their Forebears had been, saw that that vast Map was Useless, and not without some Pitilessness was it, that they delivered it up to the Inclemencies of Sun and Winters. In the Deserts of the West, still today, there are Tattered Ruins of that Map, inhabited by Animals and Beggars; in all the Land there is no other Relic of the Disciplines of Geography.”
Without concepts/abstraction:
Our concepts may abstract too much, with possibly bad consequences.

… are imperfect abstractions from reality, but we need them.
How do we develop scientific concepts?
If I claim…
“Countries around the world have become less democratic since 2016.”
And I tell you that my definition of “democracy” is”
“I know democracy when I see it”
Can this be “scientific evidence”?
If I claim…
“Countries around the world have become less democratic since 2016.”
And I tell you that my definition of “democracy” is
“A democracy is country where leaders are chosen by free and fair elections and everyone is equal before the law, or the country is the United States.”
Can this be “scientific evidence”?
If I claim…
“Countries around the world have become less democratic since 2016.”
And I tell you that my definition of “democracy” is”
“A democracy is a country where the leader implements the Will of the People.”
Can this be “scientific evidence”?
(1) Concepts need to be transparent
clear and accessible definition. Even if we disagree over the label, we can all assess whether a case meets the definition.
(2) Concepts must be formulated to be used systematically
Science is about systematic evidence. Cannot define concepts that include loopholes for one case. Definitions must be tied to attributes that are observable
(3) Concepts should be useful:
helpful in understanding patterns
If concepts are not systematic, not transparent…
evidence may not be able to show claims are wrong (fails weak severity)…
are abstract or general categories that we apply to particular cases using a set of rules/criteria that determine membership in the category.
For concepts to be useful in testing claims scientifically…
For concepts to be useful in building theories (not our focus):
erythrocracy:
Countries with flags that are \(50\%\) red:
Claim: Countries around the world have become less democratic since 2016.
Claim: Countries around the world have become less democratic since 2016.
Countries around the world have become less democratic since 2016.
Countries where elections are free, fair, and reoccurring; elected officials wield political power de facto; suffrage is universal; political parties and candidates can form freely and compete; the environment around elections make for a reasonably level playing field with speech, media, and civil society freedom; there are constraints on the executive by the legislature and the judiciary; and a strong rule of law ensuring that equal civil liberties are respected.
“Countries around the world have become less democratic since 2016.”
Different concepts lead to different variables, different measures, different answers.
Even if we disagree that these are definitions of “democracy”, we can still evaluate the claim using these definitions.
Which definition of “democracy” is right?
Kim Jong Un’s: “a state with ‘democratic’ in its name.”
Minimal: “government in which political decisions are made by people who acquire power through competitive elections, the results of which are respected.”
Varieties of Democracy:
From the perspective of evaluating descriptive claims, scientifically…

Which definition of “democracy” is right?
Each definition could be used in scientific evidence
Choice of which should be labeled “democracy” reflects value judgment and common usage
Depending on the questions we ask, values we espouse, etc., there are many different definitions for the same words.
Even if we disagree with definition for a specific word, good scientific concepts can be understood and used by others regardless of whether they agree with our definitions.
Kim Jong Un may insist that “a state with ‘democratic’ in its name” is a “democracy”.
But the point of contention is the term “democracy”
Kim Jong-un would have to accept that the Democratic People’s Republic of Korea does not meet this definition empirically:
“a government in which political decisions are made by people who acquire power through competitive elections, the results of which are respected (losers leave office).”
even if he rejected that this is the definition of “democracy”
To evaluate descriptive claims, we need to define concepts
Scientific concepts are systematic definitions about what relevant and observable traits makes something an “X”.
Scientific concepts are “objective” in the sense they can be used even if we disagree with them